The following does what I want:

Sub testit()
Range("b2:d2") = Array(21, 22, 23)
End Sub

But I would prefer to use a variable instead of Range("b2:d2"). (Part of a
larger macro.)

Why doesn't the following work? More importantly, how can I make it work?

Sub testit()
Dim rng
Set rng = Range("b2:d2")
rng = Array(21, 22, 23)
End Sub